Method of production of alloyed steel and iron with chromium, manganese, etc.



Patented Feb. 2, 1926.

UNITED STATES- PATEN OFFICE.

TORSTEN GEORG STIG AND JQSEF, EINAR LEONARD S'LIG, OF- DD.A NORWAY.

METHOD OF PRODUCTION OF AILOYED STEEL AND IRON WITH CHROMIUM ANG NESE, ETC.

No Drawing.

To all whom it muy'concem:

Be it known that we, Tous'rnn 'GEOBG STH; and Josur EINAR' LEONARD STIG, both invented a certain new and useful Method of Production of Alloyed Steel and Ironwith Chromium, Manganese, &c., of which the following is a specification. in the production of some alloyed steel and iron, where a relative high amou'ntLof the f added alloy metal is desired, while the amount of carbon is to be kept rather low, it is necessary to use an alloy with a very low amount of carbon, which is rather expensive.

As a rule the amount of silicon ought to be low,but on the other hand it iseas er to remove the carbon from an alloy with a hi 'h amount of silicon than from an alloy lbw in silicon, for instance by bessemerizing, because practically all carbon can be oxidized in a few minutes. If the blowing with oxidizing gases is continued long enough the same result may be attained with thefs'ilicon, but there is the risk in this case that the-metal willabsorb so large a quantity of'petrole'um' that its quality is aifccted.

' According to the present invention the following process is used The bessemerizing is interrupted at the point when the carbon is oxidized downto the amount desired, while the rest of the silicon is afterwards removed by metal oxides. The'incompletely bessemerized metal is pulverized and mixed very carefully with a suitable qluantity of pul- .,vei'ized metal oxides, whic by sufficiently high temperature oxidizes the silicon, while I '40 theo'xides are reduced to metal. This re-' action proceeds easiest if the mixture in the form of briquettes is added to the iron or i steel directly before the discharge. Because the'reaction is-exothermic, the loss of heat will be less than if the resulting alloy with a 10W: amountof silicon is used and this heat-evolution can still be increased by the addition of the knownlmixture'of pulverized aluminum and metal oxides;

Application am March 21; 1924. Serial n. 700,945.

Having now described our invention, what We claim as new and desire to secure by Letf ters Patent is: subjects of' theKing of Sweden, and both 5 residing at Odda, Hardanger, Norway, have the desired degree but not lower than that "required to retain a suflicient amount of silicon to avoid the formation of nitrides, pulverizing the product, mixing the pulverized product with a suitable quantity of pulverized metal oxides to oxidize the remaining sili'eim, introducing the mixture into melted iron or steel to form an alloy, and dischargin the alloy thus formed.

2. Process 0 producing alloyed steeland iron with chromium. which consists in bessemerizing an alloy until the carbon con-' tent is decreased .to the desired degree but not lower than that required to retain a 'sufiicient amount of silicon to avoid the 'formation of nitrides, pulverizing theproduct, mixing the pulverized product With a suitablequantity'of pulverized metal oxides to oxidize the remaining silicon, briquet-v briquetting. the mixture, introducing the briquettes into melted iron or steel, with the addition also ofthe requisite quantity of pulverized aluminum and metal oxides to obtain the required temperature, and discharging the alloy thus formed.

In testimony whereof we have signed our names to .this specification.

ronsrnn "eEoRe STIG. JOSEF- EINAR LEONARD srre. 

